using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Autofac.Extensions.DependencyInjection;
using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Serilog;

namespace Ceremony.API
{
    public class Program
    {
        public static readonly string Namespace = typeof(Program).Namespace;
        public static readonly string AppName = Namespace.Substring(Namespace.LastIndexOf('.', Namespace.LastIndexOf('.') - 1) + 1);

        public static int Main(string[] args)
        {
            var configuration = GetConfiguration();
            Log.Logger = CreateSerilogLogger(configuration);
            try
            {
                Log.Information("Configuring web host ({ApplicationContext})...", AppName);
                var host = BuildWebHost(configuration, args);
                Log.Information("Applying migrations ({ApplicationContext})...", AppName);
                //host.MigrateDbContext<IntegrationEventLogContext>((_, __) => { });
                Log.Information("Starting web host ({ApplicationContext})...", AppName);
                host.Run();
                return 0;
            }
            catch (Exception ex)
            {
                Log.Fatal(ex, "Program terminated unexpectedly ({ApplicationContext})!", AppName);
                return 1;
            }
            finally
            {
                Log.CloseAndFlush();
            }
        }

        //public static IHostBuilder CreateHostBuilder(string[] args) =>
        //    Host.CreateDefaultBuilder(args)
        //        .ConfigureWebHostDefaults(webBuilder =>
        //        {
        //            webBuilder.UseStartup<Startup>();
        //        }).UseServiceProviderFactory(new AutofacServiceProviderFactory());


        private static IWebHost BuildWebHost(IConfiguration configuration, string[] args) =>
          WebHost.CreateDefaultBuilder(args)
         .CaptureStartupErrors(false)
         .UseStartup<Startup>()
         .UseContentRoot(Directory.GetCurrentDirectory())
         .UseConfiguration(configuration)
         .UseSerilog()
         .Build();
        private static Serilog.ILogger CreateSerilogLogger(IConfiguration configuration)
        {
            var seqServerUrl = configuration["Serilog:SeqServerUrl"];
            var logstashUrl = configuration["Serilog:LogstashgUrl"];
            return new LoggerConfiguration()
                .MinimumLevel.Verbose()
                .Enrich.WithProperty("ApplicationContext", AppName)
                .Enrich.FromLogContext()
                .WriteTo.Console()
                .WriteTo.Seq(string.IsNullOrWhiteSpace(seqServerUrl) ? "http://seq" : seqServerUrl)
                .WriteTo.Http(string.IsNullOrWhiteSpace(logstashUrl) ? "http://logstash:8080" : logstashUrl)
                .WriteTo.RollingFile(configuration["Serilog:RollingFile"])
                .ReadFrom.Configuration(configuration)
                .CreateLogger();
        }
        private static IConfiguration GetConfiguration()
        {
            var builder = new ConfigurationBuilder()
                 .SetBasePath(Directory.GetCurrentDirectory())
                 .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
                 .AddEnvironmentVariables();
            var config = builder.Build();
            if (config.GetValue<bool>("UseVault", false))
            {
                builder.AddAzureKeyVault(
                    $"https://{config["Vault:Name"]}.vault.azure.net/",
                    config["Vault:ClientId"],
                    config["Vault:ClientSecret"]);
            }

            return builder.Build();
        }
    }
}
